Details

Autor(en) / Beteiligte

• Palanque-Delabrouille, Nathalie
• Yèche, Christophe
• Borde, Arnaud
• Le Goff, Jean-Marc
• Rossi, Graziano
• Viel, Matteo
• Aubourg, Éric
• Bailey, Stephen
• Bautista, Julian
• Blomqvist, Michael
• Bolton, Adam
• Bolton, James S.
• Busca, Nicolás G.
• Carithers, Bill
• A. C. Croft, Rupert
• Dawson, Kyle S.
• Delubac, Timothée
• Font-Ribera, Andreu
• Ho, Shirley
• Kirkby, David
• Lee, Khee-Gan
• Margala, Daniel
• Miralda-Escudé, Jordi
• Muna, Demitri
• Myers, Adam D.
• Noterdaeme, Pasquier
• Pâris, Isabelle
• Petitjean, Patrick
• Pieri, Matthew M.
• Rich, James
• Rollinde, Emmanuel
• Ross, Nicholas P.
• Schlegel, David J.
• Schneider, Donald P.
• Slosar, Anže
• Weinberg, David H.

Titel

The one-dimensional Lyα forest power spectrum from BOSS

Ist Teil von

• Astronomy and astrophysics (Berlin), 2013-11, Vol.559, p.1-19

Ort / Verlag

United States: EDP Sciences

Erscheinungsjahr

2013

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• We have developed two independent methods for measuring the one-dimensional power spectrum of the transmitted flux in the Lyman-α forest. The first method is based on a Fourier transform and the second on a maximum-likelihood estimator. The two methods are independent and have different systematic uncertainties. Determination of the noise level in the data spectra was subject to a new treatment, because of its significant impact on the derived power spectrum. We applied the two methods to 13 821 quasar spectra from SDSS-III/BOSS DR9 selected from a larger sample of over 60 000 spectra on the basis of their high quality, high signal-to-noise ratio (S/N), and good spectral resolution. The power spectra measured using either approach are in good agreement over all twelve redshift bins from ⟨z⟩ = 2.2 to ⟨z⟩ = 4.4, and scales from 0.001 km s-1 to 0.02 km s-1. We determined the methodological andinstrumental systematic uncertainties of our measurements. We provide a preliminary cosmological interpretation of our measurements using available hydrodynamical simulations. The improvement in precision over previously published results from SDSS is a factor 2–3 for constraints on relevant cosmological parameters. For a ΛCDM model and using a constraint on H0 that encompasses measurements based on the local distance ladder and on CMB anisotropies, we infer σ8 = 0.83 ± 0.03 and ns = 0.97 ± 0.02 based on H i absorption in the range 2.1 < z < 3.7.